L 134 engine

kendak · Post by **kendak** » Thu Apr 26, 2012 7:48 pm

anybody know where I can look up the deck height on the L 134 engine...thanks for any help

kendak · Post by **kendak** » Sat Apr 28, 2012 6:45 pm

deck is 13.5 thanks for all the help

Post by **wesk** » Sat Apr 28, 2012 8:07 pm

Maybe those that viewed this post did not know the answer.

I own the web site and I did not know the answer. I could have measured one of my used blocks but that would not have helped you since I have no idea how many times they may have been decked during rebuilds.

Is your 13.5" answer from a Willys blueprint or from measuring the height of an old block?

kendak · Post by **kendak** » Sun Apr 29, 2012 6:31 am

military spec. sheet 13.548 to 13.559...would have thought that those people that worship the jeep would have known that by memory....didn't mean to step on any toes by asking a basic rebuild question...as always thanks for the help...

B.T.W. I know that you own the web site you've stated that before & I thank you for it...take care Kent

Post by **wesk** » Mon Apr 30, 2012 10:28 am

Kent,

I mentioned my ownership of the site in the context that "Even as the site owner I do not have a certifiable source for that data on deck height. " And obviously based on the lack responses the rest of the folks were't being mean, they just did not have an answer for you.

That deck height data is not in the specifications and dimension pages of either the M38 engine TM 9-1804A or the MB engine TM 9-1803A or the M38A1 engine TM 9-8015-1 nor the civvy SM-1002 & IS-1009 either. Which military sheet did you find that data on?

kendak · Post by **kendak** » Mon Apr 30, 2012 6:37 pm

sorry about that numbers should read 13.559 to 13.564 on the L134 Willys engine ...these spec. came from an Allis Chalmers SM for a M-7 tracked snow tractor powered by the Willys "go-devil" L134 not military.... my mystake..built in 1944 & 45

kendak · Post by **kendak** » Mon Apr 30, 2012 6:55 pm

just kinda hard for me to believe that nobody on this site ever built their own engine....deck height is criticle in finding correct cr. & ch. of pistons...if the pistons don't reach the deck then CC's of head mean nothing....I guess I'm just different & dance to a different tune....built my first engine in 1962 & have built 100hp. L134 before but to make them live you need to keep it around 85hp.....thanks & you & your site take care....Kent

Jim · Post by **Jim** » Mon Apr 30, 2012 7:13 pm

I've never built my own engine, but I can saddle a horse,
shoe it, castrate calves, and get 3 out of 5 on a man-size
silhoutte at 200 yards in 1 minute 43 seconds with an 1853
Enfield Musket. And I know that two's double on Right Face.
Perhaps someday I'll build an engine. If you'd asked about
the above, I could have helped. Sorry about that.

Jim in Darkest Arkansas
Formerly Limited Coast WHG629
Formerly Coast Guard NM2WAX
NRA Patron Life Member
M38 and 8N Ford 1949 tractor
&c.

donthedickens · Post by **donthedickens** » Mon Apr 30, 2012 7:29 pm

kendak wrote:just kinda hard for me to believe that nobody on this site ever built their own engine....deck height is criticle in finding correct cr. & ch. of pistons...if the pistons don't reach the deck then CC's of head mean nothing....I guess I'm just different & dance to a different tune....built my first engine in 1962 & have built 100hp. L134 before but to make them live you need to keep it around 85hp.....thanks & you & your site take care....Kent

==============================
I'd like to hear more about the deck height. I've rebuilt (replaced a bunch of parts) in several engines. I won't mind getting a bit more power out of the next one I work on. To be quite honest, I don't even know what you mean by cr & ch. of pistons.

All education welcome.
Thanks in advance.

kendak · Post by **kendak** » Mon Apr 30, 2012 8:16 pm

cr= compression ratio
ch= compression height [center piston pin to top of piston]
piston needs to be level with deck ....stock 6.48:1 cr is way to low for blended gas ...needs to be around 8:1 ...look on the KB-Silvolite website for formulas....I run 100LL AV gas in everything I own it's cheaper ,no corn in it ,still has lead & store for years....does not melt carb parts...gets 3 to 4mpg. better mileage in my 2500HD Chevy with a 6L gas engine

Post by **wesk** » Mon Apr 30, 2012 11:27 pm

It has usually been simpler to just check the installed top of the piston in the full up position relative to the block's deck with a straight edge. With flat top pistons, all the valves in the block, and 60 HP @ 4000 RPM the hot engine stuff like rod stretch, valve lift and etc doesn't play much here. The majority of folks here have the machine work done at the auto machine shop where those numbers are found in great abundance.

Very few here run anything other than pump gas. I have run 115/145 from the early 60's through the 70's and 100 LL since in varying blending ratios without concerning myself with any need for increasing compression ratios. A slight change in timing is all that is needed.

kendak · Post by **kendak** » Tue May 01, 2012 5:53 am

I guess it's a location thing there are no auto machine shops around here ...you're stuck with Auto-Zone, Pep-Boy's ,etc. or dealership & the 20yr. old tech. there have no clue what a valve in block is.....high octane fuel has less BTU's than reg. gas so if used with low comp. engine you lose HP...only with higher comp. engines can you gain anything...I use the 100LL AV gas because it is designed to sit for long periods of time in planes without breaking down & does not destroy non-ferrus parts in weed eaters ,lawn mowers & old vehiciles, antique tractors & planes that sit like my Super-Cub..take care